AI Trajectory

null

{
  "EnableConfigs": [
    "ADFS_FS"
  ],
  "FocusSymbols": [
    "adfs_fplus_getnext",
    "adfs_fplus_iterate"
  ],
  "Reasoning": "The patch adds a bounds check to `adfs_fplus_getnext` in the ADFS filesystem to prevent an out-of-bounds read/write when handling directory entries with long names. This is a functional change in a filesystem which is reachable and should be fuzzed.",
  "WorthFuzzing": true
}

null

{
  "PatchDiff": "commit f9facb45e0601275be68e479dfc9871317349b0c\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Wed Jul 15 17:43:51 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/fs/adfs/dir_fplus.c b/fs/adfs/dir_fplus.c\nindex 4a15924014da27..c68c301d890339 100644\n--- a/fs/adfs/dir_fplus.c\n+++ b/fs/adfs/dir_fplus.c\n@@ -192,6 +192,8 @@ adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj)\n \tobj-\u003eindaddr  = le32_to_cpu(bde.bigdirindaddr);\n \tobj-\u003eattr     = le32_to_cpu(bde.bigdirattr);\n \tobj-\u003ename_len = le32_to_cpu(bde.bigdirobnamelen);\n+\tif (obj-\u003ename_len \u003e ADFS_MAX_NAME_LEN - 4)\t/* leave room for ,xyz suffix */\n+\t\treturn -EIO;\n \n \toffset = adfs_fplus_offset(h, le32_to_cpu(h-\u003ebigdirentries));\n \toffset += le32_to_cpu(bde.bigdirobnameptr);\n"
}

gemini-3.1-pro-preview

null

{
  "EnableConfigs": [
    "ADFS_FS"
  ],
  "FocusSymbols": [
    "adfs_fplus_getnext",
    "adfs_fplus_iterate"
  ],
  "Reasoning": "The patch adds a bounds check to `adfs_fplus_getnext` in the ADFS filesystem to prevent an out-of-bounds read/write when handling directory entries with long names. This is a functional change in a filesystem which is reachable and should be fuzzed.",
  "WorthFuzzing": true
}

You are an expert Linux kernel maintainer.
Your job is to review a provided patch series and determine
if it makes functional changes to the kernel that should be fuzzed.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively
use your code access tools to examine the actual source code and confirm any assumptions.

Return WorthFuzzing=false if the patch only contains:
- Modifications to Documentation/, Kconfig files, or code comments.
- Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints.
- Changes to numeric constants or macros that do not functionally alter execution flow.
- Code paths that are impossible to reach in virtualized environments like GCE or QEMU,
even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim).

If it modifies reachable core kernel logic, drivers, or architectures, use your code search
tools to verify the code can be executed, then return WorthFuzzing=true.

When returning WorthFuzzing=true, you MUST ALSO:
1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols.
   Avoid listing generic hot-path functions to prevent skewed test distributions.
2. Identify any specific CONFIG_ options required to properly test this new/modified feature.
   Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions.
   Do not list too generic configs (we already have them enabled). Only list those that
   specifically cover the modified code. List them in the EnableConfigs output array,
   and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

For your convenience, here is the diff of the changes:
commit f9facb45e0601275be68e479dfc9871317349b0c
Author: syz-cluster <triage@syzkaller.com>
Date:   Wed Jul 15 17:43:51 2026 +0000

    syz-cluster: applied patch under review

diff --git a/fs/adfs/dir_fplus.c b/fs/adfs/dir_fplus.c
index 4a15924014da27..c68c301d890339 100644
--- a/fs/adfs/dir_fplus.c
+++ b/fs/adfs/dir_fplus.c
@@ -192,6 +192,8 @@ adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj)
 	obj->indaddr  = le32_to_cpu(bde.bigdirindaddr);
 	obj->attr     = le32_to_cpu(bde.bigdirattr);
 	obj->name_len = le32_to_cpu(bde.bigdirobnamelen);
+	if (obj->name_len > ADFS_MAX_NAME_LEN - 4)	/* leave room for ,xyz suffix */
+		return -EIO;
 
 	offset = adfs_fplus_offset(h, le32_to_cpu(h->bigdirentries));
 	offset += le32_to_cpu(bde.bigdirobnameptr);

gemini-3.1-pro-preview

null

null

							input: 1928
							output: 61
							thoughts: 155
						

**Analyzing the ADFS Filesystem Patch**

Okay, so I've got this patch here that's touching `fs/adfs/dir_fplus.c`. Looks like it's adding a new check in the `adfs_fplus_getnext` function. Specifically, it's a length check on the filename extracted from the directory entry. They're adding a sanity check: if the `name_len` exceeds `ADFS_MAX_NAME_LEN - 4`, it'll return `-EIO`. That's a good defensive programming practice, preventing potential buffer overflows.

This is definitely a functional change to the ADFS filesystem. I need to understand the context of this change a bit better before I can sign off on it. I need to check the configuration options related to ADFS to see if there's anything relevant there. And, I really want to refresh my memory on the interactions of `adfs_fplus_getnext`.

Time to fire up `grepper`. I'll search for the ADFS configuration symbols, and I'll also search for `adfs_fplus_getnext` to see if there are any other uses of the function, or related code that might shed light on this change. Let's see what we can find.

{
  "Expression": "adfs_fplus_getnext",
  "PathPrefix": "fs/adfs/"
}

{
  "Output": "fs/adfs/dir_fplus.c=171=static int\nfs/adfs/dir_fplus.c:172:adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj)\nfs/adfs/dir_fplus.c-173-{\n--\nfs/adfs/dir_fplus.c=212=static int adfs_fplus_iterate(struct adfs_dir *dir, struct dir_context *ctx)\n--\nfs/adfs/dir_fplus.c-221-\nfs/adfs/dir_fplus.c:222:\twhile (!adfs_fplus_getnext(dir, \u0026obj)) {\nfs/adfs/dir_fplus.c-223-\t\tif (!dir_emit(ctx, obj.name, obj.name_len,\n--\nfs/adfs/dir_fplus.c=282=const struct adfs_dir_ops adfs_fplus_dir_ops = {\n--\nfs/adfs/dir_fplus.c-285-\t.setpos\t\t= adfs_fplus_setpos,\nfs/adfs/dir_fplus.c:286:\t.getnext\t= adfs_fplus_getnext,\nfs/adfs/dir_fplus.c-287-\t.update\t\t= adfs_fplus_update,\n"
}

{
  "Expression": "config ADFS",
  "PathPrefix": "fs/adfs/"
}

{
  "Output": "fs/adfs/Kconfig-1-# SPDX-License-Identifier: GPL-2.0-only\nfs/adfs/Kconfig:2:config ADFS_FS\nfs/adfs/Kconfig-3-\ttristate \"ADFS file system support\"\n--\nfs/adfs/Kconfig-22-\nfs/adfs/Kconfig:23:config ADFS_FS_RW\nfs/adfs/Kconfig-24-\tbool \"ADFS write support (DANGEROUS)\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 2904
							output: 116
							thoughts: 157
						

**Fuzzing Strategy for AD FS Filesystem Directory Iteration**

Okay, so I've pinpointed a promising area for fuzzing within the ADFS filesystem. The target is clear: the function `adfs_fplus_getnext`. This function is, of course, called by `adfs_fplus_iterate`, which is itself a component of `adfs_fplus_dir_ops`. Given this call chain, it is a high-value target for investigation. The config to enable is definitely `ADFS_FS`, and I will make the focus symbols `adfs_fplus_getnext` and `adfs_fplus_iterate` for the fuzzing run.

Now, a quick check to make sure I am enabling the correct configuration. The relevant patch is within `adfs_fplus_getnext`, which, from what I can see, deals with read operations specifically related to retrieving directory entries. Consequently, enabling `ADFS_FS` should be sufficient, and `ADFS_FS_RW` is not necessary. I want to streamline the configuration to minimize unnecessary complexity during the fuzzing.

Alright, with that confirmed, I am ready to move forward. I will call `set-results` now.

{
  "EnableConfigs": [
    "ADFS_FS"
  ],
  "FocusSymbols": [
    "adfs_fplus_getnext",
    "adfs_fplus_iterate"
  ],
  "Reasoning": "The patch adds a bounds check to `adfs_fplus_getnext` in the ADFS filesystem to prevent an out-of-bounds read/write when handling directory entries with long names. This is a functional change in a filesystem which is reachable and should be fuzzed.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "ADFS_FS"
  ],
  "FocusSymbols": [
    "adfs_fplus_getnext",
    "adfs_fplus_iterate"
  ],
  "Reasoning": "The patch adds a bounds check to `adfs_fplus_getnext` in the ADFS filesystem to prevent an out-of-bounds read/write when handling directory entries with long names. This is a functional change in a filesystem which is reachable and should be fuzzed.",
  "WorthFuzzing": true
}